Roller boring-drill.



H. R. HUGHES. ROLLER BORING DRILL. APPLIOATIOF FILED MAY 26, 1910.

Patented Dec.27,1910;

' drills,

UNITED STATES PATENT OFFICE.

HOWARD ROBERT HUGHES, 0F HOUSTON, TEXAS.

ROLLER BORING-DRILL.

Specificatio n of Letters Iatent. PatentedjDec. 27, 1910.

Application filed May 26, 1910. Serial No. 563,640.

To all whom it may concern:

Be it known that I, HOWARD ROBERT HUGHES, a citizen of the UnitedStates, residing at Houston,'Texas, have invented a certain new anduseful Improvement in Roller Boring-Drills, of which the following is afull, clear, and exact description, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to roller boring and particularly to drills ofthat type which are provided with approximately ,frusto-conical-shapedcutting rollers that cover the ends of the spindles on which they aremounted.

One object of my present invention is to provide a drill of the typereferred to hav-' mg approximately conical-shaped spindles that providea large bearing surface for the rollers mounted on same.

Another object is to provide a roller drill having means of novelconstruction fortretaining the rollers on their spindles; And.

still another object is to provide a strong and serviceable roller drillwhich is so designed that the rollers and portions of their spindles canbe removed and replaced easily when it is necessary to renew said partson account of wear.

Other objects and desirable features of my invention will be hereinafterpointed out.

Figure 1 of the drawings is a side eleva-- tional view partly invertical section of a roller drill constructed in accordance with myinvention; Fig. 2 is a perspective view of .one of the rings that isused for retaining the rollers ontheir spindles, and Fig. 3 is aperspective view of one'of the washers that is interposed between therollers and the head of the drill. 1

Referring to the; drawings which illustrate thepreferred form of myinvention,

I A designates the head of the drill which is preferably composed ofaplurality of sections, 'and B designates the cutting rollers that aremounted on said head. The drill herein shown is provided with a pair ofap roximately frusto-conical-sha'ped cutting rol ers which are-arrangedin a V-shaped ocket formed in the end face of the head ut I do not wishit to be understood that my invention is limited to the exactconstruction herein shown as the particular number of rollers and thearrangement of said rollers on the head is immaterial so far as certainfeatures of my present invention are concerned,

Each of the rollers B is rotatably mounted ona spindle which is composedof a per-- manent portion 1 anda removable portion 2 whose outer surfaceis approximately frusto-conical-shape so as to provide a large bearingsurface for the roller which is mounted thereon. The permanent portion 1of the spindle is preferably integrally connected to the head of thedrill, and is provided with external screw-threads that cooperate withinternal screw-threads on the removable portion 2 so as to securely holdsaid removable portion in position, and, if desired, the permanentportion 1 can be provided at its outer end with a reduced extension 1which fits in a socket of corresponding dimensions in the removableportion 2. The removableportion 2 of the spindle is reduced at its innerend so as to form an approximately cylindrical-shaped shank 2 w nch issurrounded by aring 3 that is connected to the roller B, the enlargedpart of said removable portion 2 projecting over said ring, as shown inFig. 1, so as to prevent the roller from moving longitudinally of thespindle. 'The ring 3 can be connected to the roller Bin various Ways butI prefer to provide said ring with external screwthreads 3 thatcooperate with screw-threadson the wall of a socket formed in the baseend of the roller so as to enable the roller to be screwed onto saidring, as hereinafter described. If desired, a washer 4 can be arrangedbetween the head of the drill and the base end of the roller so as toprevent the head from being worn away, and in the embodiment of myinvention herein shown the washer 4 is so designed that the shank 2 ofthe removable portion of the spindle bears against same so as to preventsaid washer from moving longitudinally of the spindle, the head ,A beingprovided with a removable stop 5 that fits in anotch 5* in the peripheryof the washer so as to prevent said washer from rotating.-

In the operation of assembling the parts of the. drill, the washer 4 isfirst slipped over the permanent part 1 of the spindle and the ring-3 isthen slipped over said part 1. They removable part 2 of the spindle isthereafter screwed onto-the permanent part 1 so as to lock the ring 3 inposition but still permit introduced into a recess or hole 7 in the ring3. A screW-threadedplug 8 is preferably arranged in the outer end of theopening 6 in the head so as to prevent said opening and the opening 6 inthe washer and recess 7' in the ring from becoming clogged with dirt.

When it is desired to remove the roller the operator forcesa pin or toolthrough the openlngs 6 and 6 into the recess 7 so as to hold the ringstationary while the roller is being unscrewed from same, and if theremovable part 2 of the spindle has worn awa to such an extent that theroller wab les ordoes not fit same snugly said re- I movable part 2 canbe taken off the permanent part ofthe spindle and anew part 2substituted for same. In order that the operator may remove theremovable part 2 of the s indle easily I have provided the ring 3 an thereduced shank 2 of the removable part of thespin dle with openings 9 and9, respectively, so as to enable a pin or tool to'be forced into saidopenings and thus act as a handle or lever to turn or unscrew saidremovable part 2.

A spindle of the form above described is exceptlonall stron and willsuccessfully withstand t e strains to which itis sub-.

jected when the drill is in service, and as the fru st0conical-shapedouter surface of said spindle provides a large bearing surface for theroller, the cooperating bearing faces on the roller and spindle will notwear away quickly. The way in which the roller is mountedon the spindlereduces the liability of dirt and grit collecting on the cooperatingbearing surfaces of the roller and spindle, and as the ring 3 whichretains the roller in position is completely surrounded by metal thereis no possibility of said retaining ring being broken and thus permittinthe roller to drop 011' the head of the dri l. The fact that the rollersupporting spindle is exceptionally strong and can be renewed by simplysubstituting a new end portion of thespindle enables the drill to beused indefinitely and maintained at a low cost. And still anotherdesirable feature of my drill is that the parts thereof can be assembledand disassembled easily.

The pipe C or hollow operating member which imparts rotary movement tothe head of the drill clamps the sections of the head A together, and alubricant-holder D is arranged inside of said hollow operating memberfor containing a lubricating medium' that is fed through ducts 10 tosurfaces of the drill which it isdesired to lubricate. A plunger 11 isarranged in the vholder D for forcing the lubricating medium throughsaid ducts, and said plunger is provided on its opposite side-withwashers '12 which protect the lubricating medium from the water which isforced down throu h the pipe C to flush out the disintegrate material'in the hole being formed.

The pressure of the water which is forced down through the pipe'O exertspractically a constant pressure on the plunger 11 and thus causes thelubricating medium to be forced through the ducts 10 continually, and, v

if desired, a weight 13.can be'a'rranged in the holder D above the pluner 11 so as to exert a tam ing actionon sai plunger when the drill virates and when the charges of water are pumped into the pipe C.

Thecutting surfaces of the rollers may i be of any preferred design butI have found that rollers of the form herein shown are very efiicientand do not wear out or break easily, said rollers being provided withlongitudinally extending chisel-teeth 14 that are intersected by aspiral groove 15. The pitch of a portion of the'teeth of each roller isdifferent from the'remaining portion of the teeth, and the ,spiral oove15 in one roller is arranged sta gere or out of alinement with the spiragroove in the other roller sothat'the rollers will not track when thedrill is in operation. i

Having thus described my invention, what I claim asnew and desire tosecure by Leti ters Patent is: I Y

1. A roller boring (I ill, comprising ahead provided with anapproximately conicalshaped' spindle, and an approximatelyconical-shaped cutting roller mounted on said spindle.

2. A roller boring drill, comprisinga head provided with a'spmdle havingan approximately frusto-comcal-shaped outer surface, and a rollermounted on said spindle and provided with an approximatelyfrn'sto-conical-shaped cutting" surface. v

3. A roller boring drill, comprising ahead provided with a taperedspindle, and a cutting roller mounted on said spindle and covering theend of same.

4. A roller boring drill, comprising a head provided with a taperedspindle having a reduced portion, a cutting roller mounted on saidspindle and covering the end of samefand a device on said roller thatproso as to prevent the roller from moving jects into the reducedportion of said spindle roller from moving longitudinally thereof' 6. Aroller boring drill, comprising ahead provided with a tapered spindle,an approximately frusto-conical-shaped cutting roller rotatably mountedon said spindle, and a removable'ring in said roller that lies in areduced portion of said spindle and thus prevents the roller from movinglongitudinally of the spindle.

7. A roller boring drill, comprisinga head provided with inclinedspindles that project inwardly toward the longitudinal axis of the head,the outer surfaces of said spin shaped, and approximatelyfrusto-conicalshaped cutting rollers mounted on said spindles. andcovering the ends of same.

' 8. A roller boring drill, comprising ahead provided with inclinedspindles that-project inwardly toward the longitudinal axis of the head,the outer surfaces of said spindles being approximatelyfrusto-conicalshaped, approximately frusto-conical-shaped cuttingrollers mounted on said spindles and covering the ends of same, androjections on said rollers that fit in reduced portions of said spindlesand thus prevent the rollers from moving longitudinally of 1 thespindles.

9. A roller. boring drill, comprising a head,,a spindle on said headprovided with a removable bearing surface, and a roller mounted on saidspindle.

10. A roller boring drill, comprising a head, a spindle on said headprovided with an approximately frusto-conica'l-shaped re-. movablebearing surface, and a roller mounted on said spindle.

11. A roller boring drill, comprising av head, a spindle on said headprovided with a removable tapered bearing surface, and an approximatelyfrusto-conical-shaped roller mounted on said spindle and covering theend thereof.

12- A rollerboring drill, comprising a head provided with a permanentspindle portion, a removable-roller bearing surface screwed onto saidpermanent portion, and a roller surrounding said bearing surface.

13. A roller boring drill, comprising a v head provided with an integralspindlev portion that has external screw-threads, a tapered removableportion mounted on said permanentportion, and a cutting roller mountedon said tapered portion. A, 14. A; roller boring drill, comprising ahead provided with an integral spindle p01- tion that has a reducedextension, a removable roller bearing mounted on said' spindle portionand provided with a tapered outer surface, and a roller mounted on saidbearmg. i

15. A roller boring drill, comprising a head, a spindle on said headhaving an enlarged end portion, and a roller mounted on sa1 extendsunder said enlarged portion and thus retains the roller in position.

16. A roller boring drill, comprising a head provided with a spindlethat has an enlarged tapered end portion and a cylindricalshaped baseportion, a roller mounted on said spindle, and a member on said rollerthat surrounds the cylindrical-shaped portion of the spindle and bears"against the enlargedportion of said spindle.

spindle and provided with means that 17. A roller boring drill,comprising a .said bearing, and a ring on said roller that PIOJGCtSunder the tapered end portion of said bearing.

18. A roller boring drill, comprising a head, a spindle on saidheadprovided with a reduced portion, a roller mounted on said .spindle, aring in said roller that fits in the reduced portion of said spindle,said head having an opening for permitting a tool to be movedintoengagement with said ring so as to hold it at rest while the rolleris being attached thereto, and a closure for said openmg. v

19. A roller borin drill, comprising a head, a spindle on said headprovided with a reduced portion, an approximately frustoconical-shapedroller mounted on said spindle and provided at its base end with ascrew-threaded socket, aring mounted in said socket and projecting intothe reduced portion of the spindle, and a washer interposed between thebase end of the roller and the head of the drill, said head and washerbeing provided with openings for permitting a tool to be forced intoengagement with the ring so as to hold it at rest while the roller isbeing attached thereto, and a closure for said opening.

20. A roller boring drill, comprismg a head provided with ascrew-threaded spindle portion, a removable bearing screwed onto saidspindle portion and having an enlarged tapered end, a roller mounted onsaid bearing, and a ring arranged 1n a screw-threaded socket in the baseend of the roller and projecting underneath the enlarged end of saidbearing so as to retain the roller 1n position, said. removable bearingand ring being provided with openings for receiving a tool that 4 a Re'iogiee the spindle portion on said head. ice. r a 21. A roller borindrill; comprising a n e p y he eof I hereu a filg 'y head provided withinclined s indles that slgna'ture .1n the lpresence of w -5 projectinwardly toward the longitudinal thls y-fou y Of M y 1910- axis of thehead,. and approximately frusto- ARD ROBERT HUGHES conical-shapedrollersmounted on said spindles and provided with longitudinally ex-Witnesses:- tending chisel teeth, said rollers having spi- WELLS L.CHURCH, 10 rally arranged grooves which are so disposed GEORGE BAKEWELL.

is used for turning the bearing relatively to that the rollers will nottrack when inJ-serv- It is hereby certified that in Letters Patent N0.979,496, granted December. 2:],- 1910, for an improvement in RollerBoring-Drills? the name of the patenteewas erroneously written andprinted HOwai'd Robert Hughes, whereas said name should have beenwritten and printed Howard liiobard Hughes; and that the said Letter sPatent should be read with this correction therein that the sanie mayconform to the record ot the case in the Patent Ofiiee.

Signed and sealed this 17th day of January; A. D. 1911. I.

ma i i c. 0. BIL LINGS,

Acting' C'ommdssioner of Patents. I

4 a R e'iogiee the spindle portion on said head. ice. r a 21. A rollerborin drill; comprising a n e p y he eof I hereu a filg 'y head providedwith inclined s indles that slgna'ture .1n the lpresence of w -5 projectinwardly toward the longitudinal thls y-fou y Of M y 1910- axis of thehead,. and approximately frusto- ARD ROBERT HUGHES conical-shapedrollersmounted on said spindles and provided with longitudinally ex-Witnesses:- tending chisel teeth, said rollers having spi- WELLS L.CHURCH, 10 rally arranged grooves which are so disposed GEORGE BAKEWELL.

is used for turning the bearing relatively to that the rollers will nottrack when inJ-serv- It is hereby certified that in Letters Patent N0.979,496, granted December. 2:],- 1910, for an improvement in RollerBoring-Drills? the name of the patenteewas erroneously written andprinted HOwai'd Robert Hughes, whereas said name should have beenwritten and printed Howard liiobard Hughes; and that the said Letter sPatent should be read with this correction therein that the sanie mayconform to the record ot the case in the Patent Ofiiee.

Signed and sealed this 17th day of January; A. D. 1911. I.

ma i i c. 0. BIL LINGS,

Acting' C'ommdssioner of Patents. I

It is hereby certified that in Letters Patent No. 979,496, grantedDecember 2?,

1910, for an improvement in Roller Boring-Drills the name of thepatentee was erroneously written and printed Hov va'rd Robert Hughes,whereas said name should have been written and printed Howard Robm-dHug/we; and that the said Letters Patent should be read with thiscorrection therein that the same may conform to the record of the casein the Patent Oflice.

Signed and sealed this 17th day of January, A. D., 1911.

[51:411.] C. C. BILLINGS,

Actvlng Commissioner of Patents.

